Counter-rotating axial air moving device

ABSTRACT

A counter-rotating axial air moving device is disclosed. A front rotor includes a front hub, front first blades, a front annular sheet, front second blades, a front first radial zone and a front second radial zone. A rear rotor is disposed on a rear side of the front rotor and includes a rear hub, rear first blades, a rear annular sheet, rear second blades, a rear first radial zone and a rear second radial zone. A better performance is achieved by optimal matching designs of each radial partition, and the deterioration of vibration and noise is avoided.

BACKGROUND Technical Field

The technical field relates to an axial air moving device, and more particularly relates to a counter-rotating axial air moving device.

Description of Related Art

An axial air moving device is composed of a motor, a hub and a plurality of blades arranged around the hub. The motor drives the hub to rotate to make the blades push the fluid flowing, and the axis of the rotation of the motor is the same as the air flowing direction. Moreover, the axial air moving device has to generate not only high air flowrate, but also sufficient air pressure to effectively overcome the flow resistance of the environment. Accordingly, in order to improve the characteristics of static pressure versus air flowrate of the axial air moving device, the configuration of contra-rotating is often adopted with adjusting the size and angle of the blades.

However, the air pressure generated by the axial air moving device of the related art is not able to meet the growing demands of the applications, and the air pressure needs to be increased by increasing the rotation speed. Thus, that results in the deterioration of vibration and noise of the axial air moving device, and the energy consumption is increased.

In view of the above drawbacks, the inventor proposes this disclosure based on his expert knowledge and elaborate researches in order to solve the problems of related art.

SUMMARY OF THE DISCLOSURE

One object of this disclosure is to provide a counter-rotating axial air moving device with multiple blades radially partitioned. The effect of this disclosure is to provide a performance curve of higher static pressure versus air flowrate at the same rotation speed, so that the deterioration of vibration and noise may be avoided by not increasing the rotation speed, and the energy consumption is controlled.

In order to achieve the object mentioned above, this disclosure provides a counter-rotating axial air moving device with multiple blades radially partitioned including a front rotor and a rear rotor. The front rotor includes a front hub, a plurality of front first blades arranged annularly on a periphery of the front hub spacedly, a front first annular sheet connected to a periphery of the front first blades, and a plurality of front second blades arranged annularly on a periphery of the front first annular sheet spacedly. A front first radial zone is formed between the front first blades and the front first annular sheet. A front second radial zone is formed between the front first annular sheet and the front second blades. The rear rotor is disposed on a rear side of the front rotor. The rear rotor includes a rear hub and a plurality of rear first blades arranged annularly on a periphery of the rear hub spacedly, a rear first annular sheet connected to a periphery of the rear first blades, and a plurality of rear second blades arranged annularly on a periphery of the rear first annular sheet spacedly. A rear first radial zone is formed between the rear first blades and the rear first annular sheet, and a rear second radial zone is formed between the rear first annular sheet and the rear second blades. A first forced air flow generated from the front first blades flows from the front first radial zone to the rear first radial zone, and a second forced air flow generated from the front second blades flows from the front second radial zone to the rear second radial zone.

Comparing with the related art, the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure is provided with a front first annular sheet on the periphery of the front first blades of the front rotor. In addition, a rear first annular sheet is provided on the periphery of the rear first blades of the rear rotor, and the rear first annular sheet is arranged corresponding to the radial position of the front first annular sheet. Accordingly, the first forced air flow generated from the front first blades flows from the front first radial zone to the rear first radial zone. Furthermore, the second forced air flow generated from the front second blades flows from the front second radial zone to the rear second radial zone. The optimizations on the front and rear blades matching design in different radial partitions are carried out respectively. Therefore, the performance curve of the counter-rotating axial air moving device of this disclosure has a higher air pressure than that of the counter-rotating axial air moving device of the related art under the same size and rotation speed. Hence, the deterioration of vibration and noise is avoided by not increasing the rotation speed. Additionally, the energy consumption is controlled, and the practicality of this disclosure is enhanced.

BRIEF DESCRIPTION OF DRAWINGS

The features of the disclosure believed to be novel are set forth with particularity in the appended claims. The disclosure itself, however, may be best understood by reference to the following detailed description of the disclosure, which describes a number of exemplary embodiments of the disclosure, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective schematic view of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 2 is a perspective explosion view of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 3 is a front view of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 4 is a side cross sectional view of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 5 is a perspective schematic view of another embodiment of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 6 is a perspective schematic view of a still another embodiment of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 7 is a perspective schematic view of another embodiment of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure.

FIG. 8 is a comparison diagram of the performance curves of static pressure versus air flowrate of the axial counter-rotating air moving device of this disclosure and the counter-rotating air moving device of the related art under the same size and rotation speed.

FIG. 9 and FIG. 10 are the embodiment of the axial counter-rotating air moving device with multiple blades radially partitioned having double annular sheets of this disclosure.

DETAILED DESCRIPTION

The technical contents of this disclosure will become apparent with the detailed description of embodiments accompanied with the illustration of related drawings as follows. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

Please refer to FIG. 1 to FIG. 4, which depict a perspective schematic view, a perspective explosion view, a front view and a side cross sectional view of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure. The counter-rotating axial air moving device 1 with multiple blades radially partitioned of this disclosure includes a front rotor 10 and a rear rotor 20. The rear rotor 20 is disposed on a rear side of the front rotor 10 to configure the counter-rotating axial air moving device 1. Additionally, the rotation directions of the front rotor 10 and the rear rotor 20 are opposite. In other words, the front rotor 10 and the rear rotor 20 rotate in opposite directions. The diameter of the front rotor 10 is the same with the diameter of the rear rotor 20.

The front rotor 10 includes a front hub 11 and a plurality of front first blades 12 arranged annularly on a periphery of the font hub 11 spacedly, a front first annular sheet 13 connected to a periphery of the front first blades 12, and a plurality of front second blades 14 arranged annularly on a periphery of the front first annular sheet 13 spacedly. Moreover, a front first radial zone 120 is formed between the front first blades 12 and the front first annular sheet 13, and a front second radial zone 140 is formed between the front first annular sheet 13 and the front second blades 14.

It should be noted that the quantity of the front annular sheet of the front rotor 10 is not limited. In some embodiments, the quantity of the front annular sheets and the front blades of the front rotor 10 may be increased, thereby, the quantity of the front radial zones is increased.

Similarly, the rear rotor 20 includes a rear hub 21 and a plurality of rear first blades 22 arranged annularly on a periphery of the rear hub 21 spacedly, a rear first annular sheet 23 connected to a periphery of the rear first blades 22, and a plurality of rear second blades 24 arranged annularly on a periphery of the rear first annular sheet 23 spacedly. Moreover, a rear first radial zone 220 is formed between the rear first blades 22 and the rear first annular sheet 23, and a rear second radial zone 240 is formed between the rear first annular sheet 23 and the rear second blades 24.

It should be noted that the quantity of the rear annular sheet of the rear rotor 20 is not limited. In some embodiments, the quantity of the rear annular sheets and the rear blades of the rear rotor 20 may be increased, thereby, the quantity of the rear radial zones is increased. The quantity and the radial positions of the rear annular sheets is the same as that of the front annular sheets to achieve radial partitions.

Accordingly, the first forced airflow 100 generated from the front first blades 12 flows from the front first radial zone 120 to the rear first radial zone 220. Furthermore, the second forced airflow 101 generated from the front second blades 14 flows from the front second radial zone 140 to the rear second radial zone 240.

It is worth of noticing that the quantity of the front first blades 12 and the front second blades may be different, and the shapes of the front first blades 12 and the front second blades 14 may be dis-continuous. Additionally, the quantity of the rear first blades 22 and the rear second blades 24 may be different, and the shapes of the rear first blades 22 and the rear second blades 24 may be dis-continuous.

Specifically, the ratio of the hub diameter of the front hub 11 (rear hub 21) to the diameter D of the front blades is less than 0.7. Additionally, the size and the radial position of the rear first annular sheet 23 are disposed corresponding to that of the front first annular sheet 13 to achieve radial partitions. In some embodiments, the radial positions of the front first annular sheet 13 and the rear first annular sheet 23 are located between 0.28 and 0.75 overall radial span respectively. The overall radial span is defined as (D−d)/2. That is, the range of the radius r of the front first annular sheet 13 and the rear first annular sheet 23 is as follows.

${{\frac{\left( {D - d} \right)}{2} \times {0.2}8} + \frac{d}{2}} < r < {{\frac{\left( {D - d} \right)}{2} \times {0.7}5} + \frac{d}{2}}$

Please further refer to FIG. 5, which depicts a perspective schematic view of another embodiment of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure. In one embodiment of this disclosure, the counter-rotating axial air moving device 1 with multiple blades radially partitioned includes a front rotor 10 a, a rear rotor 20 a, a stator component 30 a and a housing 40 a. Additionally, the structures of the front rotor 10 a and the rear rotor 20 a are similar to the previous embodiment and here is omitted for brevity.

It is worth of noticing that the stator component 30 a is optionally arranged on a front side of the front rotor 10 a, on a rear side of the rear rotor 20 a, or between the front rotor 10 a and the rear rotor 20 a. In some embodiments, the stator component 30 a may include a plurality of pillars or a plurality of stator blades with wing sections, and the pillars or the stator blades are arranged radially corresponding to the type of the rotors.

In this embodiment, the stator component 30 a includes a plurality of stator blades with wing sections, and the stator blades are arranged radially and connected to the housing 40 a. Additionally, the stator component 30 a is disposed between the front rotor 10 a and the rear rotor 20 a.

Please further refer to FIG. 6, which depicts a perspective schematic view of a still another embodiment of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure. In one embodiment of this disclosure, the counter-rotating axial air moving device 1 b includes a front rotor 10 b, a rear rotor 20 b, a stator component 30 b and a housing 40 b. The structures of the front rotor 10 b and the rear rotor 20 b are similar to the previous embodiment and here is omitted for brevity.

In this embodiment, the stator component 30 b comprises a plurality of pillars and is connected to the housing 40 b. It should be noted that the quantity of the stator component 30 b is multiple. In this embodiment, the front side of the front rotor 10 b and the rear side of the rear rotor 20 b are provided with a stator component 30 b respectively.

Please further refer to FIG. 7, which depicts a perspective schematic view of another embodiment of the counter-rotating axial air moving device with multiple blades radially partitioned of this disclosure. In one embodiment of this disclosure, the counter-rotating axial air moving device 1 c includes a front rotor 10 c, a rear rotor 20 c, a stator component 30 c and a housing 40 c. Additionally, the structures of the front rotor 10 c and the rear rotor 20 c are similar to the previous embodiment and here is omitted for brevity.

In this embodiment, the stator component 30 c includes a plurality of stator blades with wing sections, and the stator blades are arranged radially and connected to the housing 40 c. Additionally, the quantity of the stator component 30 c is multiple. In this embodiment, the rear sides of the front rotor 10 c and the rear rotor 20 c are provided with a stator component 30 c respectively.

Please further refer to FIG. 8, which depicts a comparison diagram of the performance curves of static pressure versus air flowrate of the axial counter-rotating air moving device of this disclosure and the counter-rotating air moving device of the related under the same size and rotation speed. It is shown from the figure that, under the same air flowrate, the performance curve of the counter-rotating axial air moving device of this disclosure (represented in the thin line) has a higher air pressure than that of the counter-rotating axial air moving device of the related art (represented in the bold line). In other words, under the same air pressure, the counter-rotating axial air moving device of this disclosure has a relatively higher air flowrate. Accordingly, the counter-rotating axial air moving device of this disclosure has a higher air pressure and air flowrate than the counter-rotating axial air moving device of the related art at the same rotation speed, so that the deterioration of vibration and noise may be avoided by not increasing the rotation speed, and the energy consumption is also controlled

Please refer to FIG. 9 and FIG. 10, which are the embodiment of the axial counter-rotating air moving devices with multiple blades radially partitioned having double annular sheets of this disclosure. As shown in the figures, in this embodiment, the counter-rotating axial air moving device 1 d of this disclosure includes a front rotor 10 d and a rear rotor 20 d. The front rotor 10 d includes a front hub 11 d, a plurality of front annular sheets, and a plurality of front blades.

Specifically, the front annular sheets include a front first annular sheet 13 d and a front second annular sheet 13 d′. The front blades include a plurality of front first blades 12 d, a plurality of front second blades 14 d and a plurality of front third blades 16 d. The front first blades 12 d are arranged annularly on the periphery of the front hub 11 d spacedly. The front second blades 14 d are arranged annularly between the front first annular sheet 13 d and the front second annular sheet 13 d′. The front third blades 16 d are arranged annularly on the periphery of the front second annular sheet 13 d′ spacedly.

Moreover, a front first radial zone 120 is formed between the front first blades 12 d and the front first annular sheet 13 d. A front second radial zone 140 is formed between the front second annular sheet 13 d′ and the front second blades 14 d. A front third radial zone 160 is formed between the front third blades 16 d and the front second annular sheet 13 d′.

Similarly, the structures of the rear rotor 20 d is similar to the front rotor 10 d, and the manner of radial partitions is similar to the above description. Specifically, the rear rotor 20 d further includes a rear second annular sheet 14 d′ and a plurality of rear third blades 26 d. The rear third blades 26 d are arranged annularly on a periphery of the rear second annular sheet 14 d′ spacedly. A rear third radial zone 260 is formed between the rear third blades 26 d and the rear second annular sheet 14 d′. Additionally, the radius of the front second annular sheet 13 d′ is the same with the radius of the rear second annular sheet 14 d′.

While this disclosure has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of this disclosure set forth in the claims. 

What is claimed is:
 1. A counter-rotating axial air moving device with multiple blades radially partitioned, the counter-rotating axial air moving device comprising: a front rotor, comprising: a front hub; a plurality of front first blades, arranged annularly on a periphery of the front hub spacedly; a front first annular sheet, connected to a periphery of the front first blades; and a plurality of front second blades, arranged annularly on a periphery of the front first annular sheet spacedly; wherein a front first radial zone is disposed between the front first blades and the front first annular sheet, and a front second radial zone is disposed between the front first annular sheet and the front second blades; and a rear rotor, disposed on a rear side of the front rotor, and comprising: a rear hub; a plurality of rear first blades, arranged annularly on a periphery of the rear hub spacedly; a rear first annular sheet, connected to a periphery of the rear first blades; and a plurality of rear second blades arranged annularly on a periphery of the rear first annular sheet spacedly; wherein a rear first radial zone is disposed between the rear first blades and the rear first annular sheet, and a rear second radial zone is disposed between the rear first annular sheet and the rear second blades; wherein, a first forced air flow generated from the front first blades flows from the front first radial zone to the rear first radial zone, and a second forced air flow generated from the front second blades flows from the front second radial zone to the rear second radial zone.
 2. The counter-rotating axial air moving device according to claim 1, wherein the front rotor and the rear rotor rotate in opposite directions, and a diameter of the front rotor is the same with a diameter of the rear rotor.
 3. The counter-rotating axial air moving device according to claim 1, wherein a ratio of a hub diameter of the front hub to a diameter of the front rotor is less than about 0.7, and a ratio of a hub diameter of the rear hub to a diameter of the rear rotor is less than about 0.7.
 4. The counter-rotating axial air moving device according to claim 1, wherein a size and a radial position of the rear first annular sheet are corresponding to that of the front first annular sheet.
 5. The counter-rotating axial air moving device according to claim 1, wherein radial positions of the front first annular sheet and the rear first annular sheet are located between about 0.28 and about 0.75 radial span respectively.
 6. The counter-rotating axial air moving device according to claim 1, wherein a shape of the front first blades and a shape of the front second blades are different and dis-continuous; and a shape of the rear first blades and a shape of the rear second blades are different and dis-continuous.
 7. The counter-rotating axial air moving device according to claim 1, further comprising: a stator component, optionally arranged on a front or rear side of the front rotor, on a rear side of the rear rotor, or between the front rotor and the rear rotor.
 8. The counter-rotating axial air moving device according to claim 7, wherein the stator component comprises a plurality of pillars or a plurality of stator blades, and the pillars or the stator blades are arranged radially.
 9. The counter-rotating axial air moving device according to claim 1, wherein the front rotor further comprises: a front second annular sheet and a plurality of front third blades, and the front third blades are arranged annularly on a periphery of the front second annular sheet spacedly, and a front third radial zone is disposed between the front third blades and the front second annular sheet; and the rear rotor further comprises a rear second annular sheet and a plurality of rear third blades, and the rear third blades are arranged annularly on a periphery of the rear second annular sheet spacedly, and a rear third radial zone is disposed between the rear third blades and the rear second annular sheet, and a radius of the front second annular sheet is the same with a radius of the rear second annular sheet. 